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English definition of “erosion”

erosion

noun [U] uk   /ɪˈrəʊ.ʒən/ us    /-ˈroʊ.ʒən/

erosion noun [U] (PHYSICAL DAMAGE)

C1 the fact of soil, stone, etc. being gradually damaged and removed by the sea, rain, or wind: soil/coastal erosion

erosion noun [U] (NEGATIVE EFFECT)

C2 the fact of a good quality or situation being gradually lost or destroyed: The survey reveals a gradual erosion of the president's popularity and support.
(Definition of erosion from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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